Improvement in lifting-jacks



P. TISOHER. Lifting-Jack.

No. 219,834. Patented Sept. 23,1879.

N.PETERS, PNOTO-LITHOGRAPHER, WASHINGTON, D cv UNITED STATES PATENT OFFICE;

FREDERICK TISGHEE, 'OHAMBERSBURG, NEW JERSEY.

IMPROVEMENT lN LlFTlNG-JACKS.

Specification forming part of Letters Patent No. 2] 9,834, dated September 23, 1879 application filed August 23, 1879.

To all whom it may concern Be it known that I, FREDERICK TISGHER, of Ohambersburg, in the county of Mercer and State of New Jersey, have invented an Improvement in Lifting-Jacks, of which the following is a specification.

The object of this invention is to furnish an improved gear-screw lifting-jack; and the invention consists in the peculiar construction and combination of the constituent parts of the machine, as will be hereinafter described and claimed.

Figure 1 is a complete side elevation. Fig. 2 is a vertical intersection of the same. Fig. 3 is a front View, omitting the head and clampjoint. Fig.4 is a horizontal intersection of the lower part of Fig. 1, indicated by mm. Fig. 5

is a horizontal view of the clamp-joint. Fig. 6 is a front view of a cover to the clamp-joint. Fig. 7 is a turn-table.

' Letters of reference indicate corresponding parts.

In these drawings, A is the base, formed of iron. B is the male screw. D is the head, which may be rigidly secured to the screw or arranged to revolve thereon, as desired. E is the clamp-joint, holding gears ab 0, and revolving on base A. F is the cover to the clampjoint and of the bearings of gear-wheels a, b, and o, with a hook to keep the female screw 0 in its place. Gis the handle of the gears 11. b c. H is the turn-table on which rests the female screw 0. The steel collar 1 is fastened in the female screw, and steel collanK is fastened on the base A. L is a handle for carrying the lifting-jack. M is a wrought-iron plate, which is adjusted to the base by three pointed screws, d e f, to secure it from slipping. N are screws to hold the cover of the clamp-joint.

1 claim as my invention The combination of the base, the-male screw with lifting-foot, the female screw 0', running on the turn-table H by gear a, b 0, and the clamp-joint within which the gear-wheels are inclosed.

FREDERICK TISGHEB. Witnesses:

JOHN KRUMHOLZ, WILLIAM A. BOND. 

